X-Cor夹层结构压缩强度有限元分析  

Finite Element Analysis of X-Cor Sandwich's Compressive Strength

作　　者：党旭丹[1] 卫萌[2] 张红松[1] 肖军[3] 

机构地区：[1]河南工程学院机械工程系,郑州451191 [2]郑州大学材料科学与工程学院,郑州450001 [3]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《宇航材料工艺》2012年第4期21-25,共5页Aerospace Materials & Technology

基　　金：河南省教育厅2011年度自然科学研究计划项目(2011B430003)

摘　　要：利用有限元软件获得了X-Cor夹层结构的应力场,并对其压缩强度进行分析。提出了适合于X-Cor夹层结构失效机理分析的失效判据和材料刚度退化规则,明确其失效过程和模式。根据失效判据,采用有限元模型中发生刚度退化的单元及其分布模拟失效的类型及扩展路径,说明X-Cor夹层结构在压缩载荷下的失效机理。有限元研究表明:压缩过程中,树脂区首先失效,其次是Z-pin,主要的失效模式是Z-pin屈曲失效,失效单元的扩展路径有一定的分散性。通过有限元分析结果与试验值的比较,数值吻合较好,计算误差为-7.6%～9.5%。The finite element software was used to get the X-Cor sandwich＇ s stress fields and its compressive strength was also analysed. During the compressive strength analysis, the failure criterion and materials stiffness deg- radation rules fitting for the analysis of the X-Cor sandwich＇ s failure mechanism were proposed and the X-Cor sand- wich＇ s failure process and modes were also clarified. According to the failure criterion we used the elements with stiff- ness degradation and their distributions in the finite element model to simulate the types and propagation path of the failure and the failure mechanisms of the X-Cor sandwich under compression were explained. The finite element anal- ysis indicates that during the compression firstly the resin regions fail and secondly the Z-pins fail. The main failure mode is the Z-pin＇s elastic buckling failure and the propagation paths of the failure elements are dispersive. By con- trasting the finite element results and experiments the values are consistent well and the error range is -7.6% to 9.5%.

关 键 词：X—Cor夹层结构 压缩强度 Z—pin 有限元 失效判据 退化规则 

分 类 号：TB332[一般工业技术—材料科学与工程]